Recently, the XBB strain has attracted attention. The currently prevalent strains in my country are mainly BA.5.2 and BF.7, but dominant strains such as BQ.1 and XBB have appeared in some countries and have been detected in local cases in my country.
What you need to know about the XBB strain
1 What is the XBB.1.5 strain?
"XBB belongs to the sub-branch of Omicron and is a recombinant mutant strain of the variant strain below BA.2. has enhanced immune evasion ability, and its prevalence in some foreign areas has led to an increase in the number of infections. However, foreign data show that its pathogenicity is no different from previous strains." Li Tong, chief physician of the Department of Respiratory and Infectious Diseases at Beijing You'an Hospital, once introduced.
2 What is the current XBB.1.5 strain infection situation?
According to data from the Global Initiative for Sharing Influenza Data (GISAID), as of December 31, 2022, XBB.1.5 has been discovered in at least 74 countries and regions, and it has spread to 43 states in the United States.
According to The Paper news, Shanghai has detected XBB.1.5 infection in the gene sequencing of imported cases .
3 What are the characteristics of XBB?
According to CCTV website news, experts said that XBB may spread faster. XBB, BQ.1, and BQ.1.1 are similar in pathogenicity to previous strains, but their immune evasion ability has increased. Therefore, the virus caused by may spread faster than before.
4 Will the risk of reinfection with the new strain increase?
"The immune evasion ability of the current XBB strain has been enhanced, which is different from the BA.5 popular in my country. After a period of time after infection with BA.5, the level of protection decreases. When encountering a strain with strong immune evasion ability, the risk of reinfection will increase. However, reinfection mainly occurs in some people with low immunity. The immune function people with normal immune function have a relatively small risk of reinfection in a short period of time, and the symptoms after infection are usually milder than the first time. " Li Tong once said.
Lu Hongzhou, dean of the Third Hospital of Shenzhen, said that in recent weeks, under the epidemic of BQ.1.1 and XBB mutant strains, the new crown reinfection rate has increased from 20% to 35%, and is still increasing; during the epidemic period of BA.1 and BA.5 mutant strains, the peak reinfection rates were 15% and 20% respectively. This means that herd immunity is less effective in preventing infection with new mutant strains of BQ.1 and
5 Is it necessary to stock up on montmorillonite powder?
Liao Shanying, deputy chief physician of the Gastroenterology Department of Guangdong Provincial People's Hospital, said that the symptoms of COVID-19 infection are mainly respiratory symptoms, and some patients will also have gastrointestinal symptoms. However, the incidence rates in different clinical observation reports are different. About 10% of patients may have gastrointestinal symptoms. If diarrhea occurs due to COVID-19 infection, there are many reasons. The new coronavirus itself will infect the gastrointestinal mucosa, causing viral enteritis , resulting in diarrhea.
Li Tong, chief physician of the Department of Infectious Diseases at Beijing You'an Hospital, once said that some people infected with the new coronavirus do have symptoms of vomiting and diarrhea, which usually resolve on their own within 1 to 3 days. XBB1.5 has not been found to be more likely to invade the cardiovascular and cerebrovascular systems and the digestive system. Drugs for treating respiratory tract infections and digestive tract infections can be prepared appropriately, but there is no need to hoard them in large quantities.
6 What response strategy should we adopt?
(1) After exposure to the sun, you still need to take personal protection and wear a mask.
(2) After "Yang" or "Yang Kang", people with normal immune function have a relatively small risk of reinfection in a short period of time. Drugs for treating respiratory tract infections and digestive tract infections can be prepared appropriately on a daily basis, and there is no need to follow the trend of grabbing or hoarding drugs.
(3) Montmorillonite powder, norfloxacin (disabled for minors) and other drugs must be used scientifically and in compliance with the doctor's advice, and do not use them blindly.
Experts said that vaccination is still an important means. Although the immune barrier established by vaccination cannot effectively prevent reinfection with new strains, it still has a good protective effect in preventing severe illness and death.
is comprehensively compiled from CCTV WeChat, People's Daily Health Client, China Jiangsu Net, Jiangsu Disease Control, etc.
Editor: Zhang Huibin
Editor: Wang Zucheng
Review: Yu Weiwei
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